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Re: AO-51 (2158Z) Mid Atlantic pass.



Hi folks,

Final update on the subject for a while (at least until the next LS 
session).  03:53 pass this evening, nice and high off to the west.  Good 
strong signals on S-band, but still with a lot of QSB towards the end.  The 
trees in that direction surely have something to do with it, but I'm not 
wiggling the needle on my R-7000.  With AO-40 out at 30,000 miles, I can 
accept that, but not from a LEO.  I think I need a new feed.

But the good news is that my Shiny New Helix is working.  Nice chats with 
KD6IRE and WA6FWF.  Good quieting, like I had with the 9 element Quagi.  I 
can't tell which is better now, though it seems like the helix wasn't quite 
so picky about being on frequency for the uplink.  Is that  a sign of better 
or worse signal, or am I imagining things...?

Greg  KO6TH


----Original Message Follows----
From: "Greg D." <ko6th_greg@hotmail.com>
To: amsat-bb@amsat.org
Subject: [amsat-bb] Re: AO-51 (2158Z) Mid Atlantic pass.
Date: Tue, 10 Jul 2007 20:34:55 -0700

Well, I just finished the 03:00z pass, setting due North through the trees.
I did manage to make one contact (thanks WA6FWF!), but man, I've got work to
do.

S-band downlink was pretty crummy.  Lots of QSB - more than I remember on
other modes, and more than I would have expected given my AO-40-capable,
circular polarized 24x30 inch grill with preamp and all that.  I know I've
had better results in VS before.  But the big surprise is that my shiny new
18 turn helix seems to perform much worse than the thrown-together 9-element
quagi I had up for LU on field day.  No full quieting, and real spotty when
I did get in.  I guess the only good news is that I was able to work the
bird a lot lower in elevation than on LU for some reason.  Go figure.

Next pass in about an hour, out to the west.  Will give it another shot.

Greg  KO6TH


----Original Message Follows----
From: "Dave Aitch" <dave@g1ocn.com>
To: <amsat-bb@amsat.org>
Subject: [amsat-bb]  AO-51  (2158Z)   Mid Atlantic pass.
Date: Tue, 10 Jul 2007 23:10:46 +0100

Good downlink but no other stations heard
on the last pass (2154Z - 2202Z)  of AO-51
as it passed south to north up the middle of
the Atlantic at max elevation of 3 degrees.

10w from IC910H to 4 x 9 turn (WIMO) Helix.
BBQ dish and K5GNA downconverter.

Cheers,

Dave G1OCN
AMSAT UK 5766
IO80SM
Portland, Dorset.

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